Using jun23 m8 respin build on linux rh5.2 doesn't happen on mac or windows Edit|Preferences crashes. Not sure who owns this. linux gdb trace: (gdb) where #0 0x4007c586 in nsCOMPtr_base::~nsCOMPtr_base () #1 0x409e0ec4 in nsCSSFrameConstructor::ConstructFrame () #2 0x409dd257 in nsCSSFrameConstructor::TableProcessChild () #3 0x409dd17d in nsCSSFrameConstructor::TableProcessChildren () #4 0x409dc6bf in nsCSSFrameConstructor::ConstructTableGroupFrameOnly () #5 0x409dc3c4 in nsCSSFrameConstructor::ConstructTableGroupFrame () #6 0x409df06c in nsCSSFrameConstructor::ConstructXULFrame () #7 0x409e0e74 in nsCSSFrameConstructor::ConstructFrame () #8 0x409dd257 in nsCSSFrameConstructor::TableProcessChild () #9 0x409dd17d in nsCSSFrameConstructor::TableProcessChildren () #10 0x409dca10 in nsCSSFrameConstructor::ConstructTableRowFrameOnly () #11 0x409dc81a in nsCSSFrameConstructor::ConstructTableRowFrame () #12 0x409df17c in nsCSSFrameConstructor::ConstructXULFrame () #13 0x409e0e74 in nsCSSFrameConstructor::ConstructFrame () #14 0x409dd257 in nsCSSFrameConstructor::TableProcessChild () #15 0x409dd17d in nsCSSFrameConstructor::TableProcessChildren () #16 0x409dc6bf in nsCSSFrameConstructor::ConstructTableGroupFrameOnly () #17 0x409dc2b8 in nsCSSFrameConstructor::ConstructTableGroupFrame () #18 0x409df06c in nsCSSFrameConstructor::ConstructXULFrame () #19 0x409e0e74 in nsCSSFrameConstructor::ConstructFrame () #20 0x409dd257 in nsCSSFrameConstructor::TableProcessChild () #21 0x409dd17d in nsCSSFrameConstructor::TableProcessChildren () #22 0x409dc6bf in nsCSSFrameConstructor::ConstructTableGroupFrameOnly () #23 0x409dc2b8 in nsCSSFrameConstructor::ConstructTableGroupFrame () #24 0x409df06c in nsCSSFrameConstructor::ConstructXULFrame () #25 0x409e0e74 in nsCSSFrameConstructor::ConstructFrame () #26 0x409dd257 in nsCSSFrameConstructor::TableProcessChild () #27 0x409dd17d in nsCSSFrameConstructor::TableProcessChildren () #28 0x409dc6bf in nsCSSFrameConstructor::ConstructTableGroupFrameOnly () #29 0x409dc2b8 in nsCSSFrameConstructor::ConstructTableGroupFrame () #30 0x409db86f in nsCSSFrameConstructor::ConstructTableFrame () #31 0x409df0de in nsCSSFrameConstructor::ConstructXULFrame () #32 0x409e0e74 in nsCSSFrameConstructor::ConstructFrame () #33 0x409db3f7 in nsCSSFrameConstructor::ProcessChildren () #34 0x409ddc9b in nsCSSFrameConstructor::ConstructDocElementFrame () #35 0x409e197d in nsCSSFrameConstructor::ContentInserted () #36 0x40a5fe8e in StyleSetImpl::ContentInserted () #37 0x40934120 in PresShell::InitialReflow () #38 0x406fdb58 in XULDocumentImpl::StartLayout () #39 0x406fa70a in XULDocumentImpl::EndLoad () #40 0x4070ddf1 in XULContentSinkImpl::DidBuildModel () #41 0x4026d129 in CWellFormedDTD::DidBuildModel () #42 0x402673f8 in nsParser::DidBuildModel () #43 0x40267c08 in nsParser::ResumeParse () #44 0x402674a8 in nsParser::EnableParser () #45 0x409e55a7 in CSSLoaderImpl::Cleanup () #46 0x409e58ae in CSSLoaderImpl::SheetComplete () #47 0x409e59f5 in CSSLoaderImpl::ParseSheet () #48 0x409e5b47 in CSSLoaderImpl::DidLoadStyle () #49 0x409e5442 in CSSLoaderImpl::RecycleParser () #50 0x4021f7fe in nsUnicharStreamLoader::OnStopBinding () #51 0x4023527e in nsDocumentBindInfo::OnStopBinding () #52 0x40221ba8 in XP_FindContextOfType () #53 0x40167bfb in _init () #54 0x401fef93 in NET_ProcessNet () #55 0x402045b7 in NET_PollSockets () #56 0x4021d0fd in nsNetlibService::NetPollSocketsCallback () #57 0x400f50b2 in TimerImpl::FireTimeout () #58 0x400f53e4 in nsTimerExpired () #59 0x80e7713 in g_main_iteration () #60 0x80e6c98 in g_list_length () #61 0x80e7113 in g_list_length () #62 0x80e718a in g_main_iteration () #63 0x400b1bab in nsAppShell::GetNativeEvent () #64 0x4001e3ee in nsWebShellWindow::ShowModalInternal () #65 0x4001e348 in nsWebShellWindow::ShowModal () #66 0x40c25df5 in nsPrefWindow::showWindow () #67 0x4007faee in XPTC_InvokeByIndex () #68 0x40bb2472 in nsXPCWrappedNativeClass::CallWrappedMethod () #69 0x40bb302c in WrappedNative_CallMethod () #70 0x4033f10a in js_Invoke () #71 0x40344d92 in js_Interpret () #72 0x4033f158 in js_Invoke () #73 0x40344d92 in js_Interpret () #74 0x4033f158 in js_Invoke () #75 0x4033f321 in js_CallFunctionValue () #76 0x4032a0fd in JS_CallFunctionValue () #77 0x402d0ad4 in nsJSEventListener::HandleEvent () #78 0x4090d38d in nsEventListenerManager::HandleEvent () #79 0x406e3d08 in RDFElementImpl::HandleDOMEvent () #80 0x400b910e in nsMenuItem::DoCommand () #81 0x400b8f45 in nsMenuItem::MenuItemSelected () #82 0x400b9cea in menu_item_activate_handler () #83 0x80c451a in gtk_window_set_default_size () #84 0x809d15b in gtk_signal_connect_object () #85 0x809c7e2 in gtk_signal_connect_object () #86 0x809af1e in gtk_selection_data_set () #87 0x80bcb6c in gtk_widget_size_request () #88 0x808bcd9 in gtk_menu_shell_append () #89 0x808b1da in gtk_menu_shell_append () #90 0x80c4300 in gtk_window_set_default_size () #91 0x809c80f in gtk_signal_connect_object () #92 0x809af1e in gtk_selection_data_set () #93 0x80bca48 in gtk_widget_size_request () #94 0x808609d in gtk_get_current_event () #95 0x808563e in gtk_main_iteration_do () #96 0x80d3d13 in gdk_input_add () #97 0x80e6c98 in g_list_length () #98 0x80e7113 in g_list_length () #99 0x80e722d in g_main_iteration () #100 0x8085153 in gtk_main () #101 0x400b1aff in nsAppShell::Run () #102 0x4001a706 in nsAppShellService::Run () #103 0x8052007 in main ()

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This is no longer a problem with the jun25 build on linux. Marking worksforme.